As as user I prefer consistency . And as I work with Aura, Symfony2,
ZF1, ZF2 I love to follow spaces, than individual projects choosing their
own styles which is a main benefit probably mostly to its users like me
than the core developers of individual system who don’t care about
other projects or its users?

After all when your project says we use tabs, do you care people who love
to use spaces there? Do you merge when something like this comes?